In Matthew 17:19, the disciples ask why they failed — this verse sets up their question about their inability to heal.

In Matthew 17:20, Jesus explains the failure was due to little faith — linking the inability directly to insufficient faith.

In Luke 9:40, the father also reports the disciples' failure — a direct parallel account of this same event.

Mark 9:18 gives the parallel account, describing the boy's symptoms and the disciples' failure to cast out the demon.

In 2 Kings 4:29-31, Gehazi fails to raise a boy — mirroring the disciples' failure and highlighting reliance on the master's power.

In 2 Kings 4:31, Gehazi's failure to revive the child mirrors the disciples' inability here—both await the master's successful intervention.

In Acts 3:16, faith in Jesus' name brings healing — contrasting the disciples' failure here due to lack of faith.

In Acts 19:15, an evil spirit rejects exorcists — a parallel failure showing the need for genuine faith and authority.

In Acts 19:16, the demon attacks the failed exorcists — illustrating danger of attempted deliverance without true faith.